Question

We must ______ on our study.

1. A.
   concentrate
2. B.
   concentrate at
3. C.
   concentrate on
4. D.
   concentrate with

Answer 1

C
题意为：我们必须全神贯注于我们的学习。此题考查固定短语的应用。Concentrate on … 意为“集中（注意力）于….专心于…”。其余选线不存在搭配。故选C。